Grodan Delta 8 Block , 4"x4"x3.25" (w/ Hole) Case (180 cubes)

Whether starting your seeds and cuttings in A-OK Starters, Macroplugs, or Mini-Blocks it is a good idea to transplant into a 3 or 4 block. You know its time to transplant to the Gro-Block when roots coming out of the starter are about 1 long. Just place your Mini-Block on top of the 3 or 4 block without the hole, or your Macroplug/A-OK into the 3 or 4 block with the hole and watch your plant flourish.